zhihai xu created YARN-3241:
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Summary: Leading space, trailing space and empty sub queue name
may cause MetricsException for fair scheduler
Key: YARN-3241
URL: https://issues.apache.org/jira/browse/YARN-3241
Project: Hadoop YARN
Issue Type: Bug
Components: scheduler
Reporter: zhihai xu
Assignee: zhihai xu
Leading space, trailing space and empty sub queue name may cause
MetricsException(Metrics source XXX already exists! ) when add application to
FairScheduler.
The reason is because QueueMetrics parse the queue name different from the
QueueManager.
QueueMetrics use Q_SPLITTER to parse queue name, it will remove Leading space
and trailing space in the sub queue name, It will also remove empty sub queue
name.
{code}
static final Splitter Q_SPLITTER =
Splitter.on('.').omitEmptyStrings().trimResults();
{code}
But QueueManager won't remove Leading space, trailing space and empty sub queue
name.
This will cause out of sync between FSQueue and FSQueueMetrics.
QueueManager will think two queue names are different so it will try to create
a new queue.
But FSQueueMetrics will think these two queue names as same which will create
"Metrics source XXX already exists!" MetricsException.
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